SPN 1442 FMI 2ABS
Yaw Rate Sensor - Erratic/Intermittent Signal
Scan Tool — in guided session
DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 1442 / FMI 2
Category
ABS
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: The yaw rate sensor is typically mounted on the vehicle frame near the center of the wheelbase, often integrated with the ABS control module or mounted separately.
Common Symptoms
- ABS warning lamp illuminated
- Stability control warning lamp illuminated
- ESP/RSP fault lamp active
- Intermittent loss of stability control function
- ABS system degraded or disabled
- Erratic yaw rate readings in diagnostic software
Root Causes
- Faulty yaw rate sensor internal component failure Damaged or corroded wiring harness to yaw rate sensor Loose or intermittent connector at yaw rate sensor Water intrusion or moisture contamination in sensor connector Excessive vehicle vibration causing sensor mounting issues
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Derate Behavior
Power Derate
No
System Interactions
SPN 1442 FMI 2 interacts with the following systems and may trigger cascading faults if not resolved promptly.
Common Diagnostic Mistakes
Replacing the sensor without verifying wiring continuity and supply voltage first.
Clearing codes without identifying and resolving the root cause — the fault will return.
Ignoring related active faults — cascading faults often share a root cause.
Skipping the connector inspection — corrosion and damaged pins are a leading cause of sensor faults.
Condemning the ECM before exhausting all wiring and component tests.
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OEM System Resources
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Related Diagnostic Articles
Deep-dive diagnostic page: SPN 1442 FMI 2 — Full FSM Sequence & Repair Steps — includes wiring notes, sensor specs, and gated repair procedures.
Authority References
Diagnostic procedures on this page are informed by OEM service literature and industry standards.
Cummins QuickServe OnlineOfficial Cummins service manuals, fault code lookup, and TSB database.Detroit Diesel DiagnoCentralDetroit Diesel diagnostic procedures, DDDL documentation, and service literature.PACCAR MX Engine ServicePACCAR MX-11 and MX-13 engine service documentation and DAVIE diagnostic guides.Volvo/Mack Tech ToolVolvo and Mack engine fault code reference and PTT/Tech Tool diagnostic procedures.ASE — Diesel Truck Technician CertificationNational Institute for Automotive Service Excellence — T2 Diesel Engines certification standards.EPA Aftertreatment & Emissions GuidelinesU.S. EPA heavy-duty diesel aftertreatment compliance, DPF/SCR regulations, and NOx standards.
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